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High7.8Red Hat Linux

High [CVE-2026-34001] X.Org X server: Use-after-free vulnerability leads to server crash and potential memory corruption

This high-severity Red Hat Linux advisory covers CVE-2026-34001 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION, Red Hat Enterprise Linux 7 Extended Lifecycle Support.

CVE-2026-34001 Published Apr 23, 2026
CVE-2026-34001
Affected products & platforms
Red Hat LinuxUnclassified
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Summary

X.Org X server: Use-after-free vulnerability leads to server crash and potential memory corruption. Red Hat rates this important (CVSS 7.8).

Weakness: CWE-825. Affected package(s): tigervnc, xorg-x11-server-Xwayland, xorg-x11-server.

Resolved in Red Hat advisory RHSA-2026:24341 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; and 11 more.

Affected versions
  • tigervnc-0:1.11.0-8.el8_4.15
  • xorg-x11-server-Xwayland-0:21.1.3-10.el9_2
  • tigervnc-0:1.14.1-10.el9_6
  • tigervnc-0:1.15.0-6.el9_7.1
  • xorg-x11-server-Xwayland-0:21.1.3-2.el8_6.6
  • xorg-x11-server-0:1.20.11-34.el9_8
  • tigervnc-0:1.15.0-7.el9_8.1
  • xorg-x11-server-Xwayland-0:24.1.5-6.el10_1
  • xorg-x11-server-0:1.20.11-20.el9_2
  • xorg-x11-server-Xwayland-0:24.1.5-6.el10_0
  • tigervnc-0:1.12.0-15.el8_8.17
  • xorg-x11-server-Xwayland-0:21.1.3-5.el9_0

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions
  • RHSA-2026:24341

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Update the affected package(s) to the fixed version shipped in RHSA-2026:24341 (`sudo dnf update` / `yum update`).

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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